ISO/TR 12764:1997, Measurement of fluid flow in closed conduits - Flowrate measurement by means of vortex shedding flowmeters inserted in circular cross-section conduits running full

This Technical Report provides generic information on vortex shedding flowmeters, including a glossary and a set of engineering equations useful in specifying performance. It describes the typical construction of vortex shedding flowmeters and identifies the need for inspection, certification, and material traceability. It also provides technical information to assist the user in selecting and applying vortex shedding flowmeters, and provides calibration guidance. It explains the relevant terminology and describes test procedures, together with a list of specifications, application notes, and equations with which to determine the expected performance characteristics.This Technical Report describes how the frequency of the vortices is a measure of the fluid velocity; how volume, mass, and standard volume flowrate are determined; and how the total fluid that has flowed through the meter in a specified time interval can be measured.This Technical Report applies only to full-bore flowmeters (not insertion types) and applies only to fluid flow that is steady or varies only slowly with time, and is considered to be single-phased, with the closed conduit running full.